There may be things we don't know about. For example, both of them may have agreed in advance to do the shows to earn some money, but he may have been feeling hurt that she was able to replace his so soon, so he may have decided to change his mind. And she may be angry because she knows she needs the money because Ingo is not paid by the Federation... The relationships are complicated if a couple have been working together for such a long time. It is a working relationship, but at the same time the length of the working relationship may have crossed the boundaries more towards a friend rather than a colleague, so it can be upsetting that the friend suddenly does not want to help you. But the friend may have mixed feelings, hurt etc.